hist = {
	name = "history",
	version = "38",
	initialised = false,
	SV={},
	L={},
	me = {},
	playerName = "",	-- might change
	playerID = "",  	-- Unique through renames
	tz_offset =0,
	debug = false
}
--GetWorldName()
local function log_truncate(max)
	--Limit log to max
	for _ = max, (#hist.SV.log-1)  do
		table.remove(hist.SV.log,1)
		if hist.debug then
		d("Truncated log.  Size now:  " .. tostring(#hist.SV.log))
		end
	end
end


local function log(text)

table.insert(hist.SV.log,{["TimeStamp"]=GetTimeStamp(),
	["text"] = text,
	["Char"] = hist.playerName,
	["CharID"] = hist.playerID,
	["world"] = GetWorldName(),
	})
end

local function log_me(text)	-- per char log

table.insert(hist.me.log,{["TimeStamp"]=GetTimeStamp(),
["text"] = text,
})
end

local Keep_Achievement = function (id) -- is this an achievement we want to save?

	if hist.IDs[id] then
		return true
	else
		return false
	end
end

local function get_start ()	-- get better start date from Achievements
	-- Check Achievements
	local earliest_time = 0
	local earliest_Achievement
	for id, ach in pairs(hist.me.ach) do
		if earliest_time == 0 then
		earliest_time = ach.time
		earliest_Achievement = id
		elseif earliest_time > ach.time then
		earliest_time = ach.time
	end
end

if earliest_time == 0 then	-- No Achievements
	earliest_time = GetTimeStamp()
end

if hist.me.Created == nil	then
	hist.me.Created = earliest_time
	elseif hist.me.Created > earliest_time then		-- Quest was earlier, then reset to earlier
	if hist.debug then
d("Start Time Reset for " .. hist.playerName)
end
	log ("Start Time Reset.")
	hist.me.Created = earliest_time
	end
end

local function Achievement(_, name, points, id, link)
	local description
	local category_id  = GetCategoryInfoFromAchievementId(id)
	local category_name =GetAchievementCategoryInfo(category_id)
	_,description,_,_,_,_,_= GetAchievementInfo(id)
	if Keep_Achievement(id)  then
		hist.me.ach[id] = {}
		hist.me.ach[id].Category_ID = category_id
		hist.me.ach[id].Category = category_name
		hist.me.ach[id].time = GetTimeStamp()
		hist.me.ach[id].points = points
		hist.me.ach[id].name = zo_strformat(name)
		hist.me.ach[id].description = zo_strformat(description)
		hist.me.ach[id].link = link

		if hist.debug then
		d("Achievement Awarded:.. ")
		d(hist.me.ach[id])
		end
	end
end

local function  log_clear()
hist.SV.log = {}
log("Cleared")
end
function load_history()
-- load up historic Achievements.
-- Note some achievements like "Level 40 Hero" have become obsolete. CategoryID is nil
	log("Request to load historic Dungeon Achievements")
	local name,points,description,completed,adate,atime
	local count = 0
	local reject = 0
	local flag = 0
	for i = 1,2000 do
		name,description,points,_,completed,adate,atime= GetAchievementInfo(i)
			if completed then
				local category_id = GetCategoryInfoFromAchievementId(i)	-- nil if bad
				if category_id ~= nil and Keep_Achievement(i) then
					if hist.me.ach[i] == nil then
						hist.me.ach[i] = {}
						hist.me.ach[i].Category_ID = category_id
						hist.me.ach[i].Category = GetAchievementCategoryInfo(category_id)
						hist.me.ach[i].time = (luatz_esodate(adate .. " " .. atime)+ hist.tz_offset)
						hist.me.ach[i].points = points
						hist.me.ach[i].name = zo_strformat(name)
						hist.me.ach[i].description = zo_strformat(description)
						hist.me.ach[i].link = GetAchievementLink(i)
						count = count + 1
					end
				else
					reject = reject +1
				end
			end
		end
		log("Added " .. tostring(count) .. " historic achievements.")
		if hist.debug then
		d("Added " .. count .. " achievements.")
		d("Rejected " .. reject .. " achievements.")
	end
end

local function fix()  -- fix links etc for any old data
	local description
	hist.me.ach_updates = nil
	log("Request to fix Achievement data")
	local obsolete = 0
	for i,_ in pairs(hist.me.ach) do
		_, description,_,_,_,_,_= GetAchievementInfo(i)
		local category_id  = GetCategoryInfoFromAchievementId(i)
		local category_name =GetAchievementCategoryInfo(category_id)
		if category_id ~= nil then
			hist.me.ach[i]["Category_ID"] = category_id
			hist.me.ach[i]["Category"] = category_name
			hist.me.ach[i]["description"] = zo_strformat(description)
			hist.me.ach[i]["link"] = GetAchievementLink(i)
		else	--Obsolete
			hist.me.ach[i] = nil
			obsolete = obsolete +1
		end
	end
	local msg
	msg = obsolete .. " obsolete achievments removed."
	log (msg)
	if hist.debug then
		d(msg)
	end
end

local function new_map()
local map = zo_strformat("<<C:1>>",GetMapName())
	if hist.me.maps[map] == nil then
		hist.me.maps[map] = {}
		hist.me.maps[map].visit = 1
		hist.me.maps[map].firstvisitdate = GetTimeStamp()
		if hist.debug then
			d("New Map: " .. map )
		end
		log("New map: " .. map)
	end
	return map
end

local function Activated()
	hist.me.timeplayed_last = hist.me.timeplayed
	hist.me.timeplayed = math.floor(GetSecondsPlayed() /60)
	if hist.me.levels[hist.me.level] ~= nil then
		hist.me.levels[hist.me.level].time = hist.me.timeplayed
	end

	if hist.world.CP_Level > 0 and hist.world.CP[hist.world.CP_Level] ~= nil then
		if hist.me.timeplayed_last == nil then	-- is nil on new chars
			hist.me.timeplayed_last = 0
		end
		hist.world.CP[hist.world.CP_Level].time = hist.world.CP[hist.world.CP_Level].time + hist.me.timeplayed - hist.me.timeplayed_last
	end

	local map = new_map()
	if hist.me.maps[map].visit == nil then
		hist.me.maps[map].visit = 1
	else
		hist.me.maps[map].visit = hist.me.maps[map].visit +1
	end
end


local function levelup(_, unitTag,_)
	if unitTag ~= "player" then
		return
	end

	hist.me.base_level = GetUnitLevel("player")
	hist.me.veteran_level =  GetUnitVeteranRank("player")

	-- Duplication of info, but easier to work with
	local map = new_map()
	if hist.me.maps[map].timeslevel == nil then
		hist.me.maps[map].timeslevel = 1
		hist.me.maps[map].firstlevel = hist.me.level
	else
	hist.me	.maps[map].timeslevel = hist.me.maps[map].timeslevel + 1
	end


--	if hist.me.veteran_level > 0 then return end

	hist.me.level = hist.me.base_level + hist.me.veteran_level

	log("Level up to " .. hist.me.level)
	hist.me.levels[hist.me.level] = {
		begin = GetTimeStamp(),
		time  = 0,		-- Accumulated time in Minutes
		Ach_Points = GetEarnedAchievementPoints(),
		deaths = 0
		}

	--Update Level data with map
	if hist.me.levels[hist.me.level].map == nil then
		hist.me.levels[hist.me.level].map = map

		local msg = "First Levelup in map " .. map
		log (msg)
		if hist.debug then
			d(msg)
		end
	end
end


local function CP_Levelup(_,unitTag, _, _)
	if unitTag ~= "player" then
		return
	end

	hist.world.CP_Level=GetPlayerChampionPointsEarned()


	hist.world.CP[hist.world.CP_Level] = {}
	hist.world.CP[hist.world.CP_Level].begin= GetTimeStamp()
	hist.world.CP[hist.world.CP_Level].playerID = hist.playerID
	hist.world.CP[hist.world.CP_Level].map = new_map()
	hist.world.CP[hist.world.CP_Level].deaths =0
	hist.world.CP[hist.world.CP_Level].time=0

	hist.me.base_level = GetUnitLevel("player")
	hist.me.veteran_level =  GetUnitVeteranRank("player")
	hist.me.level = hist.me.base_level + hist.me.veteran_level

	log("CP_Level up to " .. hist.world.CP_Level)

end

local function CP_Achieved(_,_)
	log("Achieved Champion Rank.")
	log_me("Achieved Champion Rank.")
end

local function gendertext()
	if (GetUnitGender("player") == GENDER_MALE)
		then return "M"
	end

	if (GetUnitGender("player") == GENDER_FEMALE)
		then return "F"
	end
	return "U"
end

local function setup_char()
	log("Set up: " .. hist.playerName )
	hist.SV.data[hist.playerID] = {}		-- initialise data for current char, using unique GUID
	hist.me = hist.SV.data[hist.playerID]
	hist.me.name=hist.playerName

	hist.me.Class = zo_strformat("<<C:1>>",GetUnitClass("player"))
	hist.me.Race = zo_strformat("<<C:1>>",GetUnitRace("player"))
	hist.me.Gender = gendertext()
	hist.me.base_level = GetUnitLevel("player")
	hist.me.veteran_level =  GetUnitVeteranRank("player")
	hist.me.level = hist.me.base_level + hist.me.veteran_level
	hist.me.world = GetWorldName()
	hist.me.Alliance = zo_strformat("<<C:1>>",GetAllianceName(GetUnitAlliance("player")))
	hist.me.ach={}
	hist.me.maps={}
	hist.me.log={}

	hist.me.levels = {}
	hist.me.levels[hist.me.level] = {
		begin = GetTimeStamp(),
		time  = 0,		-- Accumulated time in Minutes
		Ach_Points = GetEarnedAchievementPoints(),
		deaths = 0
		}  -- end of defaults
	hist.me["LoadTime"] = GetTimeStamp()
	load_history()
	get_start()
	log_me("Started")
end

local function Dead()
	-- Per Level
	if hist.me.levels[hist.me.level] ~= nil then
		hist.me.levels[hist.me.level].deaths = hist.me.levels[hist.me.level].deaths +1	-- low level deaths -level 1 to 49, then jump to CP
	end
	-- Per Map

	local map = new_map()

	--Update map data with Deaths
	if hist.me.maps[map].deaths == nil then
		hist.me.maps[map].deaths = 0
		hist.me.maps[map].firstdeathlevel = hist.me.level
		local msg = "First Death in map " .. map
		log (msg)
			if hist.debug then
				d("First Death in map " ..map)
			end
	end
	hist.me.maps[map].deaths = hist.me.maps[map].deaths +1

	if hist.me.maps[map].firstdeathdate == nil then
		hist.me.maps[map].firstdeathdate  = GetTimeStamp()
	end

	if hist.world.CP_Level == 0 then
		d("Death: world CP level == 0,aborting processing of CP" )
	return
	end



	if hist.world.CP[hist.world.CP_Level] ~= nil then
		hist.world.CP[hist.world.CP_Level].deaths = hist.world.CP[hist.world.CP_Level].deaths +1
	else
		local msg = "Died but CP entry for " .. tostring(hist.world.CP_Level) .. " was nil."
		log (msg)
		if hist.debug then
			d(msg)
		end
	end

end

del_old_Achievements = function()
	local count = 0
	for playerID, player in pairs (hist.SV.data)  do
		log("Deleting old Achievements for " .. player.name)
		for ID, ach in pairs  (player.ach) do
			if  not (Keep_Achievement (ID)) then
			player.ach[ID] = nil
			count = count +1
			end
		end
	end
	local msg = count .. " obsolete achievement records deleted."
	log(msg)
end

del_old_levels = function ()
	for playerID, player in pairs (hist.SV.data)  do
		--  remove levels without maps- these are probably CP and dud anyway.
		log("Deleting old levels for " .. player.name)
		local dud = 0
		for key,L in pairs (player.levels) do
			if L.map == nil then
				dud = dud +1
				player.levels[key] = nil
			else

				if key > 66 then	-- is CP move to accountwide if not already there
				local cpkey = key-50	-- max level now set to 50, so everything beyon
					if hist.world.CP[cpkey] == nil then
						hist.world.CP[cpkey] = {}
						hist.world.CP[cpkey].begin = L.begin
						hist.world.CP[cpkey].map = L.map
						hist.world.CP[cpkey].deaths = L.deaths
						hist.world.CP[cpkey].playerID = hist.playerID
						hist.world.CP[cpkey].time = L.time
						log(cpkey  .. " moved to CP")
						player.levels[key] = nil		-- and delete old
					else
						log(key  .. " not moved to CP")
					end
				end
			end
		end
	end
end

function hist.Initialise(_, addOnName)
if (hist.name ~= addOnName) then return end

	-- find computed time difference.
	local now = GetTimeStamp()
	hist.datestr = GetDateStringFromTimestamp(now)
	hist.timestr = GetTimeString()
	hist.luatz_ts = luatz_esodate(hist.datestr .." " .. hist.timestr)
	hist.tz_offset = now - hist.luatz_ts



	hist.playerName = GetUnitName("player")
	hist.playerID = GetCurrentCharacterId()

	-- Load the saved variables
	hist.SV = ZO_SavedVars:NewAccountWide("History_SV", 1, nil, nil)


	if hist.SV.log == nil then
	hist.SV.log = {}
	log("hist.SV.log created")
	end

	if debug then
		log("now: " .. now)
		log("hist.datestr: " .. hist.datestr)
		log("hist.timestr: " .. hist.timestr)
		log("hist.luatz_ts: " .. hist.luatz_ts)
		log("hist.tz_offset: " ..hist.tz_offset)
	end

	if hist.SV.worlds == nil then
	hist.SV.worlds = {}
	end

	if hist.SV.worlds[GetWorldName()] == nil then
	hist.SV.worlds[GetWorldName()] = {}
	end

	hist.world = hist.SV.worlds[GetWorldName()]

	if hist.world.CP == nil then
	hist.world.CP = {}
	end

	hist.world.CP_Level = GetPlayerChampionPointsEarned()

	if (hist.SV.data == nil ) then
	hist.SV.data = {}
	log("hist.SV.data  created")
	end
	if (hist.SV.old ~= nil) then -- Delete legacy data that we never used anyway
	hist.SV.old = nil
	end

	hist.SV.CP_Level = nil

	-- once only move of CP data to new location.
	if hist.SV.CP ~= nil then
	hist.world.CP = hist.SV.CP
	hist.SV.CP = nil
	end


	-- CP leveling screwed, after all of this .. at least make current

	if hist.world.CP[hist.world.CP_Level] == nil then
		hist.world.CP[hist.world.CP_Level] = {}
		hist.world.CP[hist.world.CP_Level].begin= GetTimeStamp()
		hist.world.CP[hist.world.CP_Level].playerID = hist.playerID
		hist.world.CP[hist.world.CP_Level].map = "BORKY"
		hist.world.CP[hist.world.CP_Level].deaths =0
		hist.world.CP[hist.world.CP_Level].time=0
		hist.world.CP[hist.world.CP_Level].borked = true
		end
	--remove old achievement categories

	if hist.SV.cleaned1 == nil then
		del_old_levels()
		hist.SV.cleaned1 = 1
	end

	if hist.SV.cleaned1 == 1 then
	    del_old_Achievements()
		hist.SV.cleaned1 = 2
		log("Deleted Old Achievements, cleaned1=2")
	end


	if (hist.SV.start_version  == nil ) then
	hist.SV.start_version = hist.version
	end

	hist.SV.this_version = hist.version

	--- hist.SV.version    -- Used by ZOS System, dont touch

	if hist.SV.data[hist.playerID] == nil then
		if debug then
		log("No data found for PlayerID")
		end
	-- Ok playerID may be nil, but we might still have data under player name
	-- In which case we rename it, otherwise it is a new char.

		if hist.SV.data[hist.playerName] == nil then
		--No name, no ID, must be new.
		setup_char()
		else
		-- Ok old name data, fix it.
		log("New data format, saving " .. hist.playerName .. " as " ..  hist.playerID)
		hist.SV.data[hist.playerID] = hist.SV.data[hist.playerName]
		hist.SV.data[hist.playerID].name = hist.playerName

		hist.SV.data[hist.playerName] = nil		-- and on the eighth day God invented Lua
		end
	end

	hist.me = hist.SV.data[hist.playerID]

	hist.me.CP = nil
	hist.me.craft = nil

	hist.me.base_level = GetUnitLevel("player")
	hist.me.veteran_level =  GetUnitVeteranRank("player")
	hist.me.level = hist.me.base_level + hist.me.veteran_level
	hist.me.world = GetWorldName()




	if 	hist.me.levels == nil then
	hist.me.levels = {}
	end

	if hist.me.maps == nil then
	hist.me.maps = {}
	end

	if hist.me.log == nil then	-- special events we want to keep, like name changes
	hist.me.log = {}
	end


	if hist.debug then
	log_truncate(500)
	else
	log_truncate(20)
	end

	hist.SV.lang=GetCVar("language.2")	-- For offline use

	if hist.me.logins == nil then
	hist.me.logins = 0
	end
	hist.me.logins = hist.me.logins +1		-- count them.

	hist.me["LoginTime"] = GetTimeStamp()

	if hist.me["ReloadTime"] == nil then
	hist.me["ReloadTime"] = GetTimeStamp()
	end

	if  hist.me["ReloadTime"] + 80080 <= GetTimeStamp() then	 --  23 hours or more have past
	load_history()		-- pickup anything that might be missed
	hist.me["ReloadTime"] = GetTimeStamp()
	log ("Startup: Timed check on missed achievements.")
	end

	if hist.me.name ~= hist.playerName then
	log("Changed Name, Was " ..  hist.me.name)
	log_me("Changed Name, Was " ..  hist.me.name)
	hist.me.name = hist.playerName
	end

	if 	hist.me.Race ~= zo_strformat("<<C:1>>",GetUnitRace("player")) then
	log("Changed Race, Was " .. hist.me.Race)
	log_me("Changed Race, Was " .. hist.me.Race)
	hist.me.Race = zo_strformat("<<C:1>>",GetUnitRace("player"))
	end

	if 	hist.me.Gender ~= gendertext() then
	log("Changed Gender, Was " .. hist.me.Gender)
	log_me("Changed Gender, Was " .. hist.me.Gender)
	hist.me.Gender = gendertext()
	end

	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_ACHIEVEMENT_AWARDED, Achievement)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_LEVEL_UPDATE, levelup)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_CHAMPION_POINT_UPDATE, CP_Levelup)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_CHAMPION_LEVEL_ACHIEVED , CP_Achieved)
	--	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_VETERAN_RANK_UPDATE, levelup)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_PLAYER_ACTIVATED, Activated)
	--	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_PLAYER_DEACTIVATED, Activated)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_PLAYER_DEAD, Dead)
	EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_ZONE_CHANGED, new_map)
	hist.initialised = true
end



SLASH_COMMANDS["/histload"] = load_history
SLASH_COMMANDS["/histfix"] = fix
SLASH_COMMANDS["/histclear"] = log_clear
SLASH_COMMANDS["/histstart"] = get_start

EVENT_MANAGER:RegisterForEvent(hist.name, EVENT_ADD_ON_LOADED, hist.Initialise)